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Chapter 2 Specification of Communication port for CPU module

2 – 14

[UDP/IP]

If user turns on the ASR port open request flag [A], the ASR port is opened and it is that the ASR port is opening

because the ASR port status flag [1] is turned off. In this status, message data can be transmitted and received.

When UDP/IP other station is fixed, ARP packet is transmitted to communication destination when message data is

transmitted for the first time. If there is no response to this ARP packet, ASR port is closed and the ASR port status

flag [1] is turned off. In case of only receiving or when message data is transmitted after second time, the system does

not close the ASR port because ARP packet is not transmitted to communication destination.

If user turns off the ASR port open request flag [A], the ASR port is closed and it is indicated that the ASR port is

closing. In this status, message data cannot be transmitted and received.

Open ASR port

Close ASR port when there is no

response to ARP in sending

message data (*)

Close ASR port at the

falling of open request

[A]

[1]

Open ASR port at the rising o

open request

Close ASR port

: Operation by user

: Operation by system

Open ASR port

(*) Only when UDP/IP other station is fixed, or receiving

(sending and receiving) is chosen.

Fig. 2.13 UDP/IP for ASR port status flag and ASR port open request flag

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RTS WM300 Spécifications Page 28